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What is the IP address of Website Toolbox?
Website Toolbox uses a variety of load balancers and servers to ensure that we can maintain 100% availability of our services in the event that one or more load balancers or servers becomes unavailable. An effect of this setup is that there are no specific IP addresses that are exclusively used. The IP addresses used to provide our services can change quite often and randomly. Therefore, IP address based whitelisting should not be used. (For example, in a firewall configuration.) Instead, domain name or hostname based whitelisting should be used.